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drm/amdgpu: use a timer for fence fallback 

Less overhead than a work item and also adds proper cleanup handling.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2015-11-03 13:27:39 +01:00 committed by Alex Deucher
parent 935c186aae
commit c2776afe74
2 changed files with 36 additions and 47 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View File

@ -389,7 +389,6 @@ struct amdgpu_clock {
* Fences.
*/
struct amdgpu_fence_driver {
struct amdgpu_ring *ring;
uint64_t gpu_addr;
volatile uint32_t *cpu_addr;
/* sync_seq is protected by ring emission lock */
@ -398,7 +397,7 @@ struct amdgpu_fence_driver {
bool initialized;
struct amdgpu_irq_src *irq_src;
unsigned irq_type;
struct delayed_work lockup_work;
struct timer_list fallback_timer;
wait_queue_head_t fence_queue;
};

80
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
View File

@ -84,24 +84,6 @@ static u32 amdgpu_fence_read(struct amdgpu_ring *ring)
return seq;
}
/**
* amdgpu_fence_schedule_check - schedule lockup check
*
* @ring: pointer to struct amdgpu_ring
*
* Queues a delayed work item to check for lockups.
*/
static void amdgpu_fence_schedule_check(struct amdgpu_ring *ring)
{
/*
* Do not reset the timer here with mod_delayed_work,
* this can livelock in an interaction with TTM delayed destroy.
*/
queue_delayed_work(system_power_efficient_wq,
&ring->fence_drv.lockup_work,
AMDGPU_FENCE_JIFFIES_TIMEOUT);
}
/**
* amdgpu_fence_emit - emit a fence on the requested ring
*
@ -135,6 +117,19 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, void *owner,
return 0;
}
/**
* amdgpu_fence_schedule_fallback - schedule fallback check
*
* @ring: pointer to struct amdgpu_ring
*
* Start a timer as fallback to our interrupts.
*/
static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring)
{
mod_timer(&ring->fence_drv.fallback_timer,
jiffies + AMDGPU_FENCE_JIFFIES_TIMEOUT);
}
/**
* amdgpu_fence_activity - check for fence activity
*
@ -201,32 +196,11 @@ static bool amdgpu_fence_activity(struct amdgpu_ring *ring)
} while (atomic64_xchg(&ring->fence_drv.last_seq, seq) > seq);
if (seq < last_emitted)
amdgpu_fence_schedule_check(ring);
amdgpu_fence_schedule_fallback(ring);
return wake;
}
/**
* amdgpu_fence_check_lockup - check for hardware lockup
*
* @work: delayed work item
*
* Checks for fence activity and if there is none probe
* the hardware if a lockup occured.
*/
static void amdgpu_fence_check_lockup(struct work_struct *work)
{
struct amdgpu_fence_driver *fence_drv;
struct amdgpu_ring *ring;
fence_drv = container_of(work, struct amdgpu_fence_driver,
lockup_work.work);
ring = fence_drv->ring;
if (amdgpu_fence_activity(ring))
wake_up_all(&ring->fence_drv.fence_queue);
}
/**
* amdgpu_fence_process - process a fence
*
@ -242,6 +216,20 @@ void amdgpu_fence_process(struct amdgpu_ring *ring)
wake_up_all(&ring->fence_drv.fence_queue);
}
/**
* amdgpu_fence_fallback - fallback for hardware interrupts
*
* @work: delayed work item
*
* Checks for fence activity.
*/
static void amdgpu_fence_fallback(unsigned long arg)
{
struct amdgpu_ring *ring = (void *)arg;
amdgpu_fence_process(ring);
}
/**
* amdgpu_fence_seq_signaled - check if a fence sequence number has signaled
*
@ -289,7 +277,7 @@ static int amdgpu_fence_ring_wait_seq(struct amdgpu_ring *ring, uint64_t seq)
if (atomic64_read(&ring->fence_drv.last_seq) >= seq)
return 0;
amdgpu_fence_schedule_check(ring);
amdgpu_fence_schedule_fallback(ring);
wait_event(ring->fence_drv.fence_queue, (
(signaled = amdgpu_fence_seq_signaled(ring, seq))));
@ -490,9 +478,8 @@ int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
atomic64_set(&ring->fence_drv.last_seq, 0);
ring->fence_drv.initialized = false;
INIT_DELAYED_WORK(&ring->fence_drv.lockup_work,
amdgpu_fence_check_lockup);
ring->fence_drv.ring = ring;
setup_timer(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback,
(unsigned long)ring);
init_waitqueue_head(&ring->fence_drv.fence_queue);
@ -556,6 +543,7 @@ void amdgpu_fence_driver_fini(struct amdgpu_device *adev)
mutex_lock(&adev->ring_lock);
for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
struct amdgpu_ring *ring = adev->rings[i];
if (!ring || !ring->fence_drv.initialized)
continue;
r = amdgpu_fence_wait_empty(ring);
@ -567,6 +555,7 @@ void amdgpu_fence_driver_fini(struct amdgpu_device *adev)
amdgpu_irq_put(adev, ring->fence_drv.irq_src,
ring->fence_drv.irq_type);
amd_sched_fini(&ring->sched);
del_timer_sync(&ring->fence_drv.fallback_timer);
ring->fence_drv.initialized = false;
}
mutex_unlock(&adev->ring_lock);
@ -750,7 +739,8 @@ static bool amdgpu_fence_enable_signaling(struct fence *f)
fence->fence_wake.func = amdgpu_fence_check_signaled;
__add_wait_queue(&ring->fence_drv.fence_queue, &fence->fence_wake);
fence_get(f);
amdgpu_fence_schedule_check(ring);
if (!timer_pending(&ring->fence_drv.fallback_timer))
amdgpu_fence_schedule_fallback(ring);
FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx);
return true;
}